<Widgets>:
    Button:
        text: "Press me!"
        on_release: root.btn()


<P>:
    Label:
        text: "This is the introduction."
        size_hint: 0.6,0.2
        pos_hint: {"x":0.2, "top":1}

    Button:
        text: "Hey!"
        size_hint: 0.8,0.2
        pos_hint: {"x":0.1, "y":0.1}